When there is no author listed for a work, you still have to list that work alphabetically in your Works Cited page by using the first significant word of the title. Generally, that means ignoring a, an, and the. The Encyclopedia of Bioethics would thus be alphabetized by the word Encyclopedia.
Putting people's names in alphabetical order is done on a letter-by-letter basis. Omit titles (such as Lady, Sir, Sister), degrees (M.D., Ph.D.), etc., that precede or follow names. A suffix that is an essential part of the name such as Jr., Sr., or a roman numeral appears after the given name, preceded by a comma. (Ford, Henry J., III or Pepin, Theophilus, Jr.) The following names are in alphabetical order (based on the MLA Handbook):
Dante Alighieri (Some Italian names of the 15th century or before are alphabetized by first name)
de Gaulle, Charles (With French names, the de goes before the last name when the last name contains only one syllable. See de Maupassant, below.)
Ford, Henry E., III
Garcia Lorca, Federico (Use full surnames for Spanish names.)
Maupassant, Guy de
Pepin, R. E.
Pepin, Theophilus, Jr.
Rueda, Lope de (For Spanish names, de comes after the first name)
Saint-Exupéry, Antoine de
St. Denis, Ruth
Von Braun, Werner (See Beethoven, above.)